Cooling apparatus



June 29 1926. 1,590,514

G. E. HULSE COOLI NG APPARATUS Original Filed Feb. 8, 1922 BVR QZ-04;)

A TTORNE Y Patented June 29, 1926.

UNITED STATES 1,590,514 PATENT OFFICE.

GEORGE E. HULSE, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE SAFETY CAR HEATING & LIGHTING COMPANYv A CORPORATION OF NEW JERSEY.

COOLING APPARATUS.

Original application led February 8, 1922, Serial No. 534,878. Divided and this application led December 4, 1924.

This invention relates to cooling or refrigerating apparatus.

One of the objects of this invention is to provide a refrigerating unit of compact mechanical arrangement and construction, capable of conve-nient and rapid assembly, thus to lend itself to rapid and inexpensive manufacture, and of thoroughly reliable and dependable action when in use. Another object is to provide a compressor-condenserreceiver unit for a refrigerating apparatus, together with a motor drive for the compressor of simple yet thoroughly practical construction, compact arrangement, and capable of rapid assembly and convenient adjustment when in use. Another object is to provide a practical. arrangement for mounting and correlating the several elements of apparatus of the above-mentioned type so as to provide a substantially unitary and self-contained structure. Other objects will be in part obviousor in part pointed out hereinafter.

This application is a division of m application, Serial No. 534,878, filed February The invention accordingly consists in the features of construction, combination of elements and arrangement of parts which will be exemplified in the structure hereinafter described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawing, the single figure is a vertical central sectional view of the apparatus in assembled relation, certain related parts being. for simplicity and greater clarity, shown diagrammatically.

Referring now to the drawing, there is shown at 10 the main frame or field frame,

of an electric motor. the lower end bein provided with suitable outwardly directed lugs 11 adapted to form a standard or base for supporting the motor frame 10 in a vertical position. A suitable number of lugs 11 are provided to form a rigid support or base and suitable openings are provided in the lower end of the frame and intervening the lugs 11 for a purpose to be hereinafter more clearly set forth. The field frame 10 is provided with a lower or end piece 12 preferably integrally formed therewith and terminating in a housing 13 in which is adapted to be received the outer race 14 of Serial No. 753,924.

a` combined radial and thrust bally bearing whose inner race 15 is suitably mounted and secured to the lower end of the armature shaft 16 of the motor, thereby forming a support for'one end of the rotatable part of the motor. The housing 13 is interiorly threaded to receive the exteriorly threaded cap 17 whose inner end is adapted to engage and support the outer ball race 14 which, as will be clear from the foregoing, fits snugly within the cylindrical housing 13. The ball race 14 and with it the entire ball bearing and the armature shaft 16 may thus be not only readily assembled but also readily and conveniently adjusted in an axial direction by means of the threaded cap 17 whose position within the housing 13 may be fixed after adjustment by means of suitable screws 18 threaded into the end of the housing 13 and extending through suitable serrations in the outer periphery of the flanged portion of the cap 17.

Turning now to the support for the other end of the armature shaft 16 it will be noted that the field frame 10 of the motor is provided with a plurality of upwardly and outwardly extending arms 19 terminating in the ring portion 20 whose upper and interior faces may be machined concentrically with the interior cylindrical surface of the end housing 13 hereinbefore described. The ring portion 20 supported by and preferably formed integrally with the vertical arms 1-9 is adapted to support a spider having a ring portion 21 machined to fit the Surfaces of the ring 20. Screws 2Oa may be employed to secure these parts together. The spider is provided with a plurality of arms, two of which are shown in section at 22 and 23 and terminate in a centrally positioned and substantially cylindrical housing 24 in the lower end of which is mounted a ball bearing indicated generally at 25, the outer race 26 fitting within the lower interior of the housing 24. The interior race 27 of the ball bearing is fitted upon a sleeve 28 which is downwardly extended so as to receive within its lower end the upper end 168L of the armature shaft 16. The latter is rigidlv connected with the sleeve 28 so as to form a driving connection by means of the pin 29 passing throughthe lower end of the sleeve 28. The upper end ofthe armature shaft 16 is thus rigidly supported and it will be .not/ed that upon adjustment in an axial dif.

the sleeve 28 with its associated ball bearing may partake 'ot a like movement, the

housing 24 being suitably machined at its lower interior end as at 30 to permit ot a movement in an axial direction ot the' upper supporting ball bearing 25.

The sleeve 28 is flanged at its upper end as at 31 so as to x the position ot the inner race 2?' of the ball bearing and the latter is held in such position by the hub 32 oitV a tan indicated generally at 33, the hub 32 being threaded upon the sleeve and against the inner ball race 2'? to securely lock the latter in position. A not 34 is provided for locking the hub 32 of the tan 33 in position upon the sleeve 28. lt will be noted that the construction above described' thus permits ot a convenient and ready assembly of the several parts.

llt may atthis point be noted that the tan 33, being` thus rigidly mounted upon the shaft 16l oit the motor and being driven thereby, is etlective to draw air downwardly between the arms 22 and 23 ot the supporting spider tor a purpose to be more clearly set forth hereinafter and thereupon discharges the air outwardly between the supporting arms 19 and downwardly through the elective or operative portionsot1 the motor. The armature indicated generally at 35 and its associated tield windings indicated generally at 36 are thus provided with an eiective cooling current oit air, which may thereupon exit through the lower end of the field Jtrame 10 and through the spaces intervening. the supporting lugs or standards 11. it cover plate 37 provided with an opening through which the motor shaft 16 may pass is mounted as by screws 38 upon the interior end ot the housingl 13 whereby., together with the adjusting cap 17, the ball bearing supporting the lower end ot the shaft 16 is substantially entirely encased 'and thus protected trom dust and foreign matter which may be directed' thereto by the current'of air or otherwise.

rl"he motor may be supplied with current.

from any suitable source, as tor example' a storage battery 39, and the circuit of the motor comprising the conductors 40 and 41 and hence the operation thereof is preferably controlled by means hereinafter to be more clearly described.

Talking up now in detail the cooling apparatus there is shown and generally indicated at 42 a compressor preferably ot the rotary type mounted upon the flanged portion 43 and preferably integral with an upwardly directed extension 44 otl the housing 24 hereinbet'oredescribed. The compressor 42 is preferably built up upon the hanged end 43 of the housing 44 and may comprise :Masonic it'or example the substantially cylindrical vwall portion 45 andan end or closing plate 46 secured together as by means ot the bolts 47. rll`he end plate 46 has, an upwardly directed cylindrical extension 48 into the lower end ot which the outer race 49 of a ball bearing generally indicated at '50 is adapted to be fitted. The inner race 51 is secured-in any suitable manner to the upper end ot the shalt 52 ot the compressor. A cap 53 is threaded on to the cylindrical extension 48 of the end plat-e 46 and is adapted to close the bearing housing termed by the extension 48. The several parts forming the casing for the compressor 42 may be accurately machined so that when fitted upon the flanged portion 43 ot the housing 44 supported .by the spider arms 22 and 23 and placed in assembled relation as shown in the drawing, the upper ball bearing 42 will be in axial alinement with the lower ball bearing 25 which, as hereinbefore de scribed, is by the constructionemployed also in alinement with the lowermost ball bearing 1.4-15.` 'lhe compressor shaft 52 is extended downwardly and is in driving connection with the motor shaft 16 as follows. ln the upper end of the sleeve 28 there is pivotally Y supported a block 54 of a substantially rec` tangular cross-section, the block 54 being held in position by means ot the pin 55 passing through it and through the sleeve 28. 'lhe lower end of the compressor shaft 52 is milled out as at 56 to provide an axially extending slot in the lower end thereof into which the block 54 may be received. 'lhe milled portion or slot 56 is, moreover, of sucient extent so as to permit of a relative movement or sliding action to take place between the lower forked end of the shaft 52 and the sleeve 28 within which the lower end of the shaft 52 is received. 'lhe milled or slotted portion 56 of the shaft thus not only insures a positive drivingconnection between the compressor shaft 52 and the motor shaft 16 but also permits ot an axial adjustment of the motor shaft 16 bymeans ci the cap 17 hereinbetore described to take place without affecting the compressor shaft 52 and its upper mounting. Furthermore, it may also be noted that the lower or forked end ot the shaft 52 which straddles the block 54 preferably ts snugly withinthe sleeve 28 so that the lower end of the compressor shaft 52 is supported thereby and so that the ball bearing 25, supporting the upper end of the motor shaft 16 also forms the roller bearing forv the compressor shaft 52.

The compressor 42 on being operated is adapted to compress, as will be more clearly set' forth hereinafter, a volatile and condensable gas, such for example as sulphur dioxide, and in order to provide for adellO l vSleeve 28.

quate lubrication of the moving parts of the compressor a suitable lubricant having a different specific gravity from that of the sulphur dioxide is used and may, for example, take the form of a suitable petroleum oil. 1n order to prevent the leakage of the liquefied gas and lubricant downwardly and into the motor and its operative parts there is associated with the compressor and its driving shaft a suitable seal. This seal comprises in part a bushing 57 having suitably secured to its interior a corrugated expansible tube 58. The bushing 57 is adapted to be threaded into the housing 44 and the threaded connection indicated at 59 is made tight by means of a suitable packing or washer 60 interposed between the fianged end of' the bushing 57 and a suitable shoulder on the interior of the housing 44. The interior diameter of the expansible tube 58 is materially greater than the diameter of the shaft 52 and is adapted to encase the latter, as is clearly shown in Fig. 1 of the drawings.A At the lower end of the expansible tube 58 there is rigidly secured thereto a collar 61 shaped to form a housing for a second collar 62, which latter is preferably formed of a material of good wearing qualities such as steel for example and whose interior diameter is such as to permit the shaft 52 to rotate therein. The lower end face of the collar 62 indicated at 63 is accurately machined or surfaced to form a close fit with the up r end face of the sleeve 28 which preferab y4 is also made of a material of good wearing qualities such as steel 'for example.

The lower end face 63 of the collar 62 which, as above noted, is fixed against rotation by its engagement with the collar 61 is held in tight contact with the upper end face of the seeve 28 by reason of the tendency of the corrugated tuber 58 to expand thus preventing any leakage which may take place between the shaft 52 and the collar 62 from escaping to the exterior. Furthermore, sufficient liquid including lubricant will be supplied to the relatively moving end faces of the seal-forming collar 62 and sleeve 28 to effectively lubri'cate these surfaces a ainst excessive wear. Any leakage that fin s its way downwardly into the sleeve 28 is prevented from reaching the exterior or the moving parts of the apparatus by means o f a diaphragm indicated at 64 in the interlor of the sleeve 28 and interposed between the ends of the compressor shaft 52 and vof the lnotoi shaft 16. -The diaphragm or seal 64 may be made of any suitable material such as, for example, lead or copper, and may be expanded by hammering for example into proper sealing position,.a suitable circumferentially extending groove indicated at 65 being provided on the interior of the vthe coils.

The ti htness of the seal formed by the collar 6 and the end face ofthe sleeve 28 may be adjusted by adjusting the position of the motor shaft 16 and hence of the end face of the sleeve 28 in an axial direction by means of the adjusting cap 17 hereinbefore described.

The compressor 42 discharges the gas under relatively high pressure through the tube 66 from which it passes throughout an inner coil 67 and an outer coil 68 of a condenser. A series of copper sheets, indicated generally at 22al and spaced from one another in a preferably radial manner, arey fitted about the coils 67 and 68 and serve as cooling flanges for bringing about a more effective cooling of the fluid passing through The condenser coils and their associated cooling fianges form a substantially compact and annularly shaped condenser which preferably surrounds the compressor and is suitably supported upon the arms 22 and 23 of the supporting spider hereinbefore described. The fan 33 whose action has been hereinbefore briefly described is effective to draw a currentof air downwardly through the condenser and over the cooling flanges. thus making more effective the action of the condenser in condensing the compressed gas into liquid form. The liquefied gas passes from the condenser through the connecting tube 69 to an annular receiver 70 surrounding the condenser coils 67 and 68 and suitably supported upon the ring portion 21 of the supporting spider. The receiver in being thus positioned is also affected b a current of air drawn through the con enser which it surrounds and the cooling is thus made highly effective.

In the receiver 70 the liquid is permitted to accumulate and since, as above noted. the compressor is supplied with a suitabe lubricant, amaterial quantity of the lubricant will pass off with the gas and will, with the latter, accumulate in the receiver 70. The lubricant and the condensed gas, however, are of different specific gravities and hence a separation may take place within the receiver 7 0. Adjacent the connectin tube 69, there is positioned in the receiver 0 a baffle plate 71, extending laterally between the two annular walls of the receiver 70 and, as will also be clearly seen from the drawing, contacting with the tube and bottom of the receiver 7 0.

The mixture of lubricant and liquefied gas, entering the receiver 70 through the tube 69 is because of the baffle plate 71, made to flow completely around the annular path provided by the receiver 70 and before either lubricant or condensed gas may be withdrawn from the receiver 70, the mixture is made to traverse the entire length of the annular path. On the other side of the bafile plate 71 there extends into the receiver 7() a tube or conduit 75, the latter being extended downwardly into the receiver 70 to a point adjacent the bottom of the receiver itself. lin the course of the travel of the luJ bricant and condensed gase throughout the annular path in the lreceiver 70, the lubricant and liquefied gas are permitted lto separate, the liquefied gas, such as sulphur dioxide being of greater specific gravity than the lubricantor oil,`separates into a lower stratum, and the lubricant separates into an upper stratum. These two strata become well defined by the time the two liquids have traversed the length of the annular path in the receiver 70 and the liquids of the respective strata may thereupon be individually withdrawn. rl`he tube 75 extends into the lower stratum of sulphur dioxide vand the latter may thus be individually withdrawn; ai tube 74 is extended into the receiver 70 adjacent the battle plate 71 and its opening is at such a. height within the receiver 70 that only oil or lubricant from the upper stratum lcan be withdrawn therefrom. 'llhe tube or conduit 74 enters a cap 53 at the upper end of the compressor housing, so that the lubricant withdrawn through thetube 74 is supplied to the moving parts of the compressor. An orifice member 74a detachably mounted in the cap 53 Serves to limit the flow of lubricantto the desired extent.

As conducive to a clearer understanding of certain features of this invention, it mightbe pointed out that the liquefied gas, withdrawn through ythe tube 75 from the receiver.70, may be passed through a suitable expansion device 76 (diagrammatically indicated), the reduction in pressure thus produced permitting the liquefied gas to evaporate and resultingin a material reduction in temperature. From the expansion device the expanded gas may be passed through a suitable heat exchange apparatus diagrammatically indicated at 77 and conveniently taking the form of a coil of tubing; to the latter, the substance to be reduced in temperature may be thermally related in any suitable manner so that heat may be extracted therefrom. From the heat exchange device or coil of tubing 77, the gas may be returned to the intake side of the compressor as by way of the tube or conduit 79. The expansion device andthe heat exchange apparatus may be conveniently embodied in the forms disclosed in my abovementioned co-pendiug and parent application. 'llhe circuit 40-41 of the motor 35 may be controlled in any convenient manner` but is preferably automatically controlled as disclosed in my above-mentioned parent application. ,Y

lt will thus be seen that there has been provided in this invention an apparatus in readme which many advantages are successfully achieved. llt will be noted that there has been provided an apparatus in which the several parts may be rapidly and accurately assembled for operation and that when so assembled a compact, unitary and substantially self-contained refrigerating unit is provided. Moreover, it will be noted that the parts are of rugged and. durable construction and are thus well adapted to meet the conditions of hard practical use. lt will also be seen that the several part-s of the apparatus may be conveniently andrapidly adjusted for most effective mechanical .operation, and that, on the whole there has-been provided an apparat-us of exceedingly practical construct-ion, conducive 'not only to rapid and "inexpensive manufacture, but also to durability and dependability when in use.

As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth is to be interpreted as illustrative and not in a limiting sense.

ll claim as my invention: A

1. lln apparatus of the nature of that herein described, in combination, a main frame,A

a prime mover having a shaft rotatably supported therein, an auxiliary frame, a compressor having a Substantially Huidtight casing mounted upon said auxiliary frame and having an operative shaft extending through said casing, a detachable driving connection between said two shafts, means for mounting said auxiliary frame upon said main frame thereby to aline said two shafts in operative connection, a dctachable duid-tightconnection between said shafts and said compressor casing compris# ing an expansible sleevel surrounding said compressor shaft and rigidly secured at'one` end tovsaid casing to be movable therewith and with said auxiliary frame, a collar upon said prime mover shaft, means having a bearing surface mounted upon the other end of said expansible sleeve and adapted to contact with said collar to form therewith a l fluid-tight joint, and means for moving said prime mover shaft in an axial direction thereby to adjust the pressure of contact between the bearing surface on said expansible sleeve and said collar on said prime mover shaft.

2. lin apparatus of the nature of that herein described, in combination, a main frame,a prime mover having a shaft rotatably supported therein, an auxiliary frame, a compressor having a substantially fluidtight casing mounted upon said auxiliary frame and having an operative shaft ex tending through said casing, a" detachable' driving connection betweenl said two shafts,

. means for mounting said auxiliary frame upon said main frame thereby to aline said two shafts in operative connection, a detachable fluid-tight connection between said shafts and said compressor casing comprising an expansible sleeve surrounding said compressor shaft and rigidly secured at one end to said casing to be movable therewith and with said auxiliary frame, a collar upon said prime mover shaft, and means having a bearing surface mounted upon the other end of said expansible sleeve and adapted to contact with said collar to form therewith a fluid tight joint.

3. In apparatus of the nature of that herein described, in combination, a prime mover having an operative shaft, a compressor having a substantially fluid-tight casing into which said shaft extends, a collar mounted upon said shaft intermediate said prime mover and said compressor casing, an expansible sleeve surrounding said shaft and interposed between said casing and said collar and in Huid-tight connection at one end with said casing, means having a bearing surface mounted at the other end of said expansible sleeve adapted to engage said collar and form therewith a fluid-tight connection, and means for varying the expansive force of said expansible sleeve.

i. In apparatus of the nature of that herein` described, in combination, a prime mover having an operative shaft, a compressor having a substantially fluid-tight casing into which said shaft extends, a collar mounted upon said shaft intermediate said prime mover and said compressor casing, an expansible sleeve surrounding said shaft and interposed between said casing and said collar and in fluid-tight connection at one end with said casing, and means having a bearing surface mounted at the other end of said expansible sleeve adapted to engage said collar and form therewith a fluid-tight connection.

5. In apparatus of the nature of that herein described, iii combination, a main frame, a prime mover having an operative shaft rotatably supported within said main frame, said shaft having a collar rigidly mounted thereon substantially exteriorly of said main frame, a compressor having a substantially fluid-tight casing and an operative shaft therefor extending through said casing, means for mounting said compressor in relation to said main frame thereby to aline the shaft of said prime mover with the shaft of said compressor, a slidable driving connection between said two shafts, an expansible sleeve rigidly connected at one end thereof with said compressor casing and surrounding said compressor shaft, said sleeve being interposed between said casing and said collar, means having a bearing surface associated with said sleeve and at the other end thereof adapted to contact with said collar thereby to form a fluidtight connection, and means for moving the shaft of said prime mover longitudinally thereby/to adjust the pressure of Contact between said bearing surface and said collar.

6.-In apparatus of the nature of that herein described, in combination, a main frame provided with a bearing at one end thereof, a prime mover mounted within said frame and having one end of the operative shaft thereof rotatably supported in said end bearing, a ball bearing having `its inner race rigidly mounted upon the other end of the shaft of said prime mover, an auxiliary frame detachably secured to the other end of said main frame and rovided and supporting the outer race o said ball bearing thereby to aline said ball bearing with said first-mentioned bearing, a compressor mounted upon said auxiliary frame and having an operative shaft, means forming a, detachable driving connection between the adjacent ends of the shaft of said prime mover and of said compressor, and means for adjusting said prime mover shaft with said ball bearing in a direction axially of said shaft.

7..In apparatus of the nature of that herein described, in combination, a main frame provided with a bearing at one end thereof, a prime mover having an operative shaft one end of which is rotatably supported in said end bearing, a bearing fOr the other end of the shaft of said prime mover, a'detachable auxiliary frame secured to the other end of said main frame and adapted to support said second mentioned bearing in alinement with said end bearing, a compressor mounted upon said auxiliary frame' and having a bearing in substantial alinement with said above-mentioned bearings for supporting one end of the operative shaft of said compressor, and means forming a detachable and alining connection between the adjacent ends of the shafts of said prime mover and said compressor whereby said adjacent end of said compressor shaft is rotatably supported substantially by said second-mentioned bearing.

8. Ih apparatus of the nature of that herein described, in combination, a main frame provided with a bearing at one end thereof, a prime mover having an operative shaft one end of which is rotatably supported in said end bearing, a bearing forV the other end of the shaft of said prime mover, a detachable auxiliary frame secured to the other end of said main frame and adapted to support said second-mentioned bearing in alineinent with said end bearing, a compressor mounted upon said auxiliary frame and having` an operative shaft rotatably supported substantially in alinement with said two bearings supporting the shaft of lll liti

dit

said prime mover, and a slidable driving connection between ,the adjacent ends oit the shafts oi said prime mover and said compressor adapted to place said shafts in driving connection when said auxiliary trarne is attached to said main. frame and to disengage said driving connection when said auxiliary trame is detached trom said main it'rame. n

9. ln apparatus of the nature or that herein described, in combination, a main trame provided with a bearin at one end thereof, a prime mover mounted within said trame and having one endfot its operative :shaft rotatably supported in said end bearot its operative shaft rotatably supported in said third-mentionedl bearing, and a driving and alining connection between the other end ot the shaft ot said compressor and the shatt ot said prime mover adapted to permit relative axial. movement between said two shatts i0. lin apparatus ot the nature ot` that herein described, in combination, a main trame provided with a bearing at one end thereot, a prime mover mounted within said e and having one end oit `the shait thereot rotatably suported in said end bearing, an auxiliary ame having a pair ot alined bearings, a compressor mounted within said auxiliary trame and having its operative shaft rotatably supported wit-hin said two alined bearings, means tor securing said auxiliary trame to the other end of said main traine and adapted to aline one ot said bearings therein with saidend bearing, and means forming a driving connection between theother end ot thelshatt ot said prime mi and the shatt ot said compressor.'

Ill. ln apparatus ot the nature of that herein described, in combination, a motor trame having-.a bearing at one end thereot,`

drizshatthaving an armature mounted thereon. within said motor trame and having one end ot said shatt supported in said bearing, a compressor having au operating shalt ther-eter, means mounting said Vcompressor at the other end ot said motor nuocere 'litt ltd motor Jframe and provided with bearing means tor rotatably supporting the upper end oit said driving shaft, a vcompressor mounted upon said auxiliary trame and having an operative shaft extending in substantial alinement with said driving shaft, and means forming a detachable connection between the adjacent ends ot said two shafts.

13. ln apparatus ot the nature of that herein described, in combination, a motor trame having therein an upright driving shaft with an armature thereon, bearing means at the lower end ot said motor trame tor supporting the lower end oit said driving shalt, the upper end ot said driving shatt being recessed, a ballbearing having its inner race mounted upon the upper end of said driving shatt, an auxiliary` frame adapted to be detachablysecured to the upper end ot said motor traine, said auxiliary trame having substantially centrally disposed means tor engagin Athe outer race ot said ball bearing, an a compressor mounted upon said auxiliary `trame and having an operative shaft extending in substantial alinement with said driving shaft, the lower end ot said compressor shaft being received within the recess ot said driving dit tilt

shalt, thereby to be rotatably supported by said ball bearing.

it. lin apparatus ot the nature ot that herein described, in combination, a main trame provided with a bearing at one end thereof, a prime mover mounted within said irame and having one end ,ot the shaft thereot rotatably supported in said end bearing, an auxilidry traine member mounted upon the other end ot` said main trame and supporting bearing means thereon substau' tially alined with said end bearing, a sleeve member mounted in said bearing means, a compressor. mounted upon said aumliary tre member and having an operative shatt in substantial alinement with said prime mover shatt, and means tor rotatably supporting said compressor shaft at the end thereot remote trom said main traine, the adjacent ends ot said two shatts extending into said sleeve'member. '15.lln apparatus ot im provided with a bearing' at one end the nature or" that herein described, in combination, 'a main'113 thereof, a prime mover mounted within said frame and having one end of the shaft thereof rotatably supported in said end bearing, an auxiliary frame member mounted upon the other end of said main frame, a compressor supported by said auxiliary frame member and having its shaft extendin toward the shaft of said prime mover, a s eeve member for receiving the adjacent ends of said two shafts, a ball bearing having its inner race supported by said sleeve, and means on said auxiliary frame for supporting the outer race of said ball bearing.

16. In apparatus of the nature of that herein described, inl combination, a motor frame having a bearing at one end thereof, a driving shaft having an armature mounted thereon within said motor frame and having one end of said shaft supported in said bearing, a compressor having a supporting shaft therefor, means detachably mounting said compressor at the other end of said motor frame and with said two shafts in axial alinement, said means carrying bearing means for one of said shafts, and a driving coupling between the adjacent ends of said two shafts arranged to effect or disrupt the driving connection therebetween upon said compressor mounting means being attached to or detached from said motor frame.

17. In apparatus of the nature of that herein described, in combination, a frame carrying a prime mover having an operating shaft, a compressor having a casing through which extends the shaft of the compressor, means for securing said compressor to said frame and arranged to substantially aline the adjacent ends of said two shafts, said prime mover shafthaving a recess in the end thereof and adapted to receive therein the compressor shaft, and means in fluid tight connection with said compressor casing and adapted, upon said compressor-be- `mg secured to said frame, to be seated against the end of said prime mover shaft and form a seal therewith. l

18. In apparatus of the nature of that herein described, in combination, a main frame provided with a bearing at one end thereof and having at the other end supporting means concentric with said bearing;

i a prime mover'mounted in said frame and having one end of the shaft thereof rotatably supported in said end bearin acompresser having a casing provide with a ing an operating'shaft cent-rally supported with respect thereto, said two shafts being thereby alined and means forming aY common bearing for the adjacent ends of said two shafts.

19. In apparatus of the nature of that herein descrlbed, in combination, a main framev provided with a bearing at one end thereof and having at the ,other end supporting means concentric with said bearing, a prime mover mounted in said frame and having one end -of the shaft thereof rotatably supported in said end bearing, a compressor having ai casing provided with a bezelled portion adapted to inter-fit with said concentric supporting means and having an operating shaft centrally supported with respect thereto, thereby alined, and means forming a driving coupling between the adjacent ends of said two shafts and arranged to complete the driving connection therebetween upon said compressor casing being assembled to said main frame. i

20. In apparatus of the nature of lthat herein described, in combination, a prime mover and a compressor, each having a shaft, means supporting said prime mover and said compressor with their shafts in axial alinement, means forming a driving connection between the adjacent ends of said shafts, and means forming a Huid tight seal between the casing of the compressor and the shaft of the prime mover.

21. In apparatus of the nature of'v that herein described, in combination, a prime mover and a compressor, each having a shaft, means supporting said prime moverl and said compressor with their shafts in axial alinement, meansforming a driving connection between the ad'acent ends of said shaft, means forming a uid tightseal between the casing of the compressor and the shaft of the prime mover and dependent in its effectiveness upon the axial position of said prime mover shaft relative to the casing of the compressor, and means for adjustably moving ,said prime mover shaft in an axial direction and relative to the casing of the compressor.

name to this specification, this 21st day o November, 1924 In testimony whereof, I have signed my f GEORGE E. HULsE.

said two shafts being 

